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38 #include <sys/ioctl.h>
39 #include <sys/types.h>
46 int fail(const char *msg)
52 int main(int argc, char **argv)
57 long segsize, oldsize;
60 printf("Usage: ./segtest <segsize in kB>\n");
64 segsize = atol(argv[1]) * 1024;
68 fd = open("/dev/segdev", O_RDWR);
70 return fail("/dev/segdev");
72 oldsize = ioctl(fd, SEGDEV_IOC_SEGSIZE, 0);
75 printf("No segment found. Creating...\n");
77 if (ioctl(fd, SEGDEV_IOC_CREATESEG, segsize))
78 return fail("CREATESEG");
80 } else if (segsize != oldsize) {
82 printf("Destroying old segment...\n");
84 if (ioctl(fd, SEGDEV_IOC_DESTROYSEG, 0))
85 return fail("DESTROYSEG");
87 if (ioctl(fd, SEGDEV_IOC_CREATESEG, segsize))
88 return fail("CREATESEG");
91 segment = mmap( NULL, segsize,
92 PROT_READ | PROT_WRITE,
96 if (segment == MAP_FAILED)
99 for (i = 0; i < segsize; i++)
100 segment[i] = (char)(i & 0xff);
102 for (i = 0; i < segsize; i++)
103 if (segment[i] != (char)(i & 0xff))
104 printf("%lu: %d vs %ld\n", i, segment[i], (i & 0xff));